Defensive publication



l 259 (13S DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, S49 O.G. 1221. Identification is by serial number of the application and the heading indicates the number of pages of specification, including claims. and of sheets of drawing contained in the application as originally tiled. The file of this application is available to the public for'inspection; reproduction may be purchased for :30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Omce makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED FEBRUARY 1, 1969 683,817 ADDITIVE CONTAINING TOBACCO SMOKE FILTER John R. Hatfield, Jr., and Kyle E. Morrison, both of R0. Box 511, Kingsport, Tenn. 37662 Filed Nov. 17, 1967. Published Feb. 4, 1969 Class 131-266 No Drawing. 14 Pages Specification Tobacco smoke filter elements containing particles of anhydrated and/or hydrated magnesium sulfate for removing at least 50 percent of the total particulate matter contained in an effluent stream of tobacco smoke from a cigarette. A majority of the particles have a size of about 2.0 microns and the filter will selectively remove more nicotine than tar from the tobacco smoke. 

